Answer
$0.2,0.26$
Work Step by Step
We know that probability$=\frac{\text{number of favourable outcomes}}{\text{number of all outcomes}}.$ We have $100$ numbers in total. There are $\frac{100}{5}=20$ numbers that are divisible by $5$. Thus: $P=\frac{20}{100}=0.2$
The primes: $\{2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97\}$. Thus there are $25+1=26$ numbers that are primes or $1$.
Thus, our probability is:
$P=\frac{26}{100}=0.26$
